On 11/11/2012 4:45pm, Mike Dewhirst wrote:
Can anyone help with some unit test guidance please?
How can I trap an IntegrityError in a test to prove unique_together is
working?
I'm modelling a company and multiple divisions. A solo division doesn't
need a division.name so I'm allowing it to be blank. It's __unicode__()
method returns self.name or self.company.name
All fine so far. But I insist two divisions cannot have the same name.
In Division's Meta class we have unique_together = (company, name) and
this works as advertised
In a unit test I don't seem to be able to swallow the IntegrityError!!
............................E......
=====================================================
...
IntegrityError: duplicate key value violates unique constraint
"company_division_company_id_name_key"
DETAIL: Key (company_id, name)=(7, ) already exists.
Here is the unit test ...
def test_twodivswithnoname(self):
tstc = Company.objects.get(name='Company Inc')
tstdiv, c = Division.objects.get_or_create(company=tstc)
tstdiv.name = ''
tstdiv.save()
expected = ''
result = tstdiv.name
# prove nothing up my sleeve
self.assertEqual(result, expected)
# if name is None, __unicode__() returns the owning company name
expected = 'Company Inc'
result = '%s' % tstdiv
self.assertEqual(result, expected)
This didn't swallow it either ...
try:
tstdivb = Division.objects.create(company=tstc, name='')
except IntegrityError as e:
pass
tstdivb = Division.objects.create(company=tstc)
tstdivb.name = ''
try:
# company and name are unique together
tstdivb.save()
except IntegrityError as e:
pass
tstdivb.delete()
I've also tried self.assertRaises(IntegrityError) instead of the
try/except block. Same result.
Thanks
Mike
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